PROFACE GP2301-SC41-24V HMI Touch Panel – GP2000 Series

PROFACE GP2301-SC41-24V: 5.7-Inch STN Monochrome HMI Panel in the GP2000 Series Control Architecture

The PROFACE GP2301-SC41-24V is a 5.7-inch STN monochrome Human-Machine Interface panel belonging to Pro-face’s GP2000 series — a platform engineered for deterministic operator interaction in discrete manufacturing, process control, and machine automation environments. Operating on a 24 VDC supply rail, this panel integrates an analog resistive touch surface with a 320 × 240 pixel (QVGA) display matrix, delivering sufficient pixel density for structured alarm pages, trend graphs, and multi-layer navigation menus without the thermal and cost overhead of color TFT technology. Its serial-centric communication architecture — RS-232C and RS-422/485 — positions it as a direct interface node for legacy PLC backplanes where Ethernet fieldbus infrastructure is absent or cost-prohibitive to retrofit.

Within a control loop, the GP2301-SC41-24V functions as the operator-facing supervisory layer between the field device network and the human decision point. It does not participate in real-time closed-loop control; instead, it aggregates tag data polled from the connected PLC via serial driver, renders process values and alarm states on-screen, and translates operator touch inputs into discrete write commands back to the controller. This separation of HMI logic from PLC scan logic is architecturally sound: it isolates display refresh latency from the deterministic cycle time of the control program, preventing screen rendering overhead from introducing jitter into the PLC’s I/O scan.

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Technical Parameters

Hardware Logical Analysis

The GP2301-SC41-24V is built on a single-board architecture where the display controller, touch digitizer ASIC, serial communication UART, and CPU core share a common PCB substrate. The CPU — a 16/32-bit embedded processor clocked in the low-MHz range — executes the GP-PRO/PB III runtime environment, which handles screen object rendering, tag polling cycles, and alarm queue management in a cooperative multitasking model. Screen refresh and serial polling are time-sliced: the runtime allocates fixed time windows to each task, ensuring that a high-frequency tag poll does not starve the display refresh pipeline.

EMC Design: The panel’s metal enclosure acts as a Faraday shield, attenuating radiated emissions and providing a low-impedance ground return path for the PCB. The RS-422/485 port uses differential signaling with ±7 V common-mode rejection, making it inherently resistant to ground potential differences between the HMI and PLC — a common source of communication errors in industrial cabinets with long cable runs. Ferrite beads on the power input lines suppress conducted high-frequency noise from switching power supplies, and the 24 VDC input circuit includes transient voltage suppression (TVS) diodes rated for IEC 61000-4-5 surge immunity.

Touch Digitizer: The 4-wire analog resistive touch layer operates by applying a voltage gradient across the resistive sheet and measuring the voltage at the contact point via an ADC. This mechanism is immune to electromagnetic interference that would affect capacitive sensors, and it responds to any stylus or gloved finger — a practical requirement in environments where operators wear cut-resistant or chemical-resistant gloves. Touch debounce filtering is implemented in firmware to reject spurious contacts from panel vibration.

Serial Communication Architecture: The RS-232C port supports point-to-point connections at baud rates up to 115,200 bps. The RS-422/485 port supports multi-drop topologies with up to 31 nodes on a single bus segment, enabling the GP2301-SC41-24V to serve as a master polling device in a distributed serial network. The UART hardware includes hardware flow control lines (RTS/CTS) on the RS-232C port, reducing the risk of buffer overrun during high-throughput tag polling sessions.

Display Thermal Management: STN LCD technology has a narrower operating temperature range than TFT but consumes significantly less power and generates less heat — an advantage in sealed enclosures where thermal dissipation is limited. The CCFL backlight is driven by a high-voltage inverter circuit with automatic brightness control; the inverter is the primary wear component and is field-replaceable on this platform.

System Integration Benefits

• Protocol-native PLC connectivity: Built-in serial drivers for Mitsubishi MELSEC (FX, Q, A series), Omron (C, CJ, CS via Host Link/FINS), Siemens S7-200/300 (PPI/MPI via adapter), Keyence KV, Panasonic FP, and generic Modbus RTU — eliminating the need for third-party protocol converters in most legacy installations.
• Deterministic tag polling: The GP-PRO/PB III runtime uses a fixed polling interval architecture. Tag update rates are configurable per screen, allowing high-priority process values to be polled at shorter intervals than static display elements — optimizing serial bus utilization without overloading the PLC communication buffer.
• Alarm management with event logging: The panel supports alarm history logging to internal flash memory, with configurable alarm priority levels, acknowledgment tracking, and time-stamped event records. This provides a local audit trail independent of the PLC’s own diagnostic buffer.
• IP65 front-panel sealing: The gasket-sealed front bezel prevents ingress of coolant mist, cutting fluid, and wash-down water — qualifying the panel for direct installation in machine tool enclosures and food-grade processing environments without additional protective covers.
• Vibration and shock tolerance: Rated to 9.8 m/s² continuous vibration and 147 m/s² shock, the panel maintains display integrity and communication stability on mobile equipment, press lines, and conveyor-mounted control stations where structural vibration is a constant operating condition.
• Software project continuity: Existing GP-PRO/PB III project files are directly executable on this hardware without modification. GP-Pro EX supports the GP2000 series in legacy compatibility mode, allowing incremental migration to the current software platform without hardware replacement.
• Standardized panel cutout: The 174 × 129 mm cutout dimension is shared across the GP2000 series family, enabling direct mechanical substitution of a failed unit without enclosure rework — reducing mean time to repair (MTTR) in production environments where panel downtime is measured in lost production units per minute.
• Diagnostic transparency: The runtime provides a built-in communication monitor mode that displays raw serial frame data, enabling field engineers to diagnose PLC driver configuration errors, baud rate mismatches, and framing errors without external serial analyzers.

Quality Assurance & Global Logistics

Each GP2301-SC41-24V unit supplied through siemensplc.com is sourced as genuine PROFACE (Pro-face / Schneider Electric) factory-manufactured hardware. Units are new surplus stock — original manufacturer packaging, factory-sealed, with intact date codes and manufacturer labels. No refurbishment, repackaging, or component-level repair has been performed. Prior to dispatch, each unit undergoes a visual inspection covering enclosure integrity, connector pin condition, label legibility, and packaging seal status.

Shipments originate from our warehouse in Xiamen, China — a major logistics hub with direct access to DHL Express, FedEx International Priority, and UPS Worldwide Expedited services. Standard international transit times are 3–7 business days to Europe, North America, Southeast Asia, and the Middle East. Expedited next-flight-out options are available for critical production downtime situations. All shipments include commercial invoice, packing list, and certificate of origin documentation. Export compliance screening is performed on all orders; end-user declarations are provided upon request for destinations requiring them under applicable export control regulations.

A 12-month warranty covers manufacturing defects identified under normal operating conditions. Warranty claims are processed with a target response time of 48 hours from receipt of the defective unit. Replacement units are dispatched from in-stock inventory to minimize production impact.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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